//抽象类,抽象方法
abstract class Girl13 {
  abstract skill(): void;
}

class Waiter13 extends Girl13 {
  skill() {
    console.log("倒水");
  }
}

class BaseTeacher extends Girl13 {
  skill() {
    console.log("基础按摩");
  }
}
class seniorTeacher extends Girl13 {
  skill() {
    console.log("全身spa按摩");
  }
}
